
<!doctype html>
<html class="no-js" lang="en">
<head>
	<meta charset="utf-8">
	<title></title>
	<meta name="description" content="">
	<meta name="viewport" content="width=device-width">
	<meta name="theme-color" content="#ff9900">
	<link rel="stylesheet" href="styles.css">
	<style>
		span:nth-child(3n+1){
			background-color: yellow;
			border-radius: 50%;
		}
			
		
	</style>
</head>

<body>
	<span></span>
	<span></span>
	<span></span>
	<span></span>
	<span></span>
	<span></span>
	<span></span>
	<span></span>
	<span></span>
	<span></span>
	<span></span>
	<span></span>
	<span></span>
	<span></span>
	<span></span>
	<span></span>
	<span></span>
	<span></span>
	<span></span>
	<span></span>
	<span></span>
	<span></span>
</body>
</html>